Glossary

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 Viewer

A viewer is a software application or tool designed to display a specific type of file (usually one that contains something other than text) that your web browser normally can't display on its own. There are viewers to display graphics files, and to play sound or video files.

 Virtual Reality

Virtual reality, sometimes called VR, refers to computer simulations of real-world "environments" that use 3-D graphics and external devices like a dataglove or helmet to allow users to interact with the simulation. Users move through virtual reality environments as though they were navigating in real worlds, walking through structures and interacting with objects in the environment.

 VoIP

Voice over IP (or VoIP) is the conversion of analog speech signals used on current telephone systems into digital data, allowing calls to be sent over the Internet, bypassing long distance charges. While the Internet was first devised as a way of transmitting data, it is now being used to make voice calls. Vonage and Skype are good examples of VoIP services on the internet.